SPACEWARN Bulletin Number 513

C. Spacecraft Particularly Suited for International Participation: Category I

Global Positioning System satellites useful for navigational
purposes and geodetic studies. ("NNN" denotes no national name. SPACEWARN
would appreciate suggestions to update this list. An asterisk [*] denotes
changes in this issue.)

High precision (<20 cm) GPS constellation tracking data obtained from
the network of about 80 dedicated global stations that are of interest to
geodetic study may be obtained through the following services provided
by the International Association of Geodesy (IGS)